Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o valor da taxa marginal de imposto de renda ordinário para solteiros em que a faixa é de $8,351 a $33,950?
 ###Tabelas: CREATE TABLE season_5_1992 (season_5_1992_id AUTO_INCREMENT PRIMARY KEY, Number in series INT, Number in season INT, Title VARCHAR, Directed by VARCHAR, Original air date VARCHAR, Production code VARCHAR) CREATE TABLE vocabulary_comparison (vocabulary_comparison_id AUTO_INCREMENT PRIMARY KEY, English VARCHAR, Scots VARCHAR, West Frisian VARCHAR, Afrikaans VARCHAR, Dutch VARCHAR, Dutch ( Limburgish ) VARCHAR, Low German VARCHAR, Low German ( Groningen ) VARCHAR, Middle German ( Luxemburgish ) VARCHAR, German VARCHAR, Yiddish VARCHAR, Gothic VARCHAR) CREATE TABLE planitia (planitia_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Latitude VARCHAR, Longitude VARCHAR, Diameter (km) INT, Year named INT) CREATE TABLE regular_and_capital_gains_tax_rates_for_2009 (regular_and_capital_gains_tax_rates_for_2009_id AUTO_INCREMENT PRIMARY KEY, Marginal Ordinary Income Tax Rate VARCHAR, Single VARCHAR, Married Filing Jointly or Qualified Widow(er) VARCHAR, Married Filing Separately VARCHAR, Head of Household VARCHAR) CREATE TABLE january_secondary_phase (january_secondary_phase_id AUTO_INCREMENT PRIMARY KEY, Round INT, Name VARCHAR, Position VARCHAR, School VARCHAR, Signed VARCHAR)  
SELECT COUNT Marginal Ordinary Income Tax Rate FROM regular_and_capital_gains_tax_rates_for_2009 WHERE Single = $8,351– $33,950